Good point and definitely worth remembering.
But we're talking about simple box shapes with some text floating above.
Though I cannot check this myself, I don't believe that my printer is making these knock-outs up. So I am inclined to believe that Xara - despite object options "Overprint Fill" - exported the PDF/X with knock-outs.
I just moved the black texts to a new layer and will be sending off a new PDF to the printer's. Hopefully more news tomorrow.
Stephan
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